Each year, Forbes Magazine releases its list of the world's richest billionaires. Ninety-five members of the list have at least a partial interest in oil or energy. Here are the top 25 from the world of oil and energy. less

Each year, Forbes Magazine releases its list of the world's richest billionaires. Ninety-five members of the list have at least a partial interest in oil or energy. Here are the top 25 from the world of oil and ... more

Forbes Overall Rank: No. 51
Net Worth: $17.2 billion
Age: 56
Source of Income: Appointed by government to lead Skolkovo, Russia's version of Silicon Valley. Also has interests in thin-film energy technologies.
Country: Russia

Forbes Overall Rank: No. 215
Net Worth: $6.3 billion
Age: 50
Source of Income: One of four children to inherit the fortune of father Dan Duncan, an energy pipeline magnate who was the former richest man in Houston.
Country: United States

Forbes Overall Rank: No. 215
Net Worth: $6.3 billion
Age: 31
Source of Income: One of four children to inherit the fortune of father Dan Duncan, an energy pipeline magnate who was the former richest man in Houston.
Country: United States
*No photo available

Forbes Overall Rank: No. 215
Net Worth: $6.3 billion
Age: 44
Source of Income: One of four children to inherit the fortune of father Dan Duncan, an energy pipeline magnate who was the former richest man in Houston.
Country: United States
*No photo available

Forbes Overall Rank: No. 215
Net Worth: $6.3 billion
Age: 52
Source of Income: One of four children to inherit the fortune of father Dan Duncan, an energy pipeline magnate who was the former richest man in Houston.
Country: United States

Forbes Overall Rank: No. 253
Net Worth: $5.6 billion
Age: 71
Source of Income: Chairman and CEO of Hunt Consolidated. Hunt Oil is one of the largest privately-held oil companies in the U.S. Sold a one-third stake in Eagle Ford shale in Texas for $1.3 billion in 2011. Also has various real estate interests.
Country: United States

Forbes Overall Rank: No. 256
Net Worth: $5.5 billion
Age: 84
Source of Income: Owner of Irving Oil, which operates more than 900 gas stations in the U.S. and Canada, as well as Canada's largest oil refinery.
Country: Canada
*No photo available